melilitite

melilitite

[mə′lil·ə‚tīt]
(petrology)
An extrusive rock that is generally olivine-free and composed of more than 90% mafic mineral such as melilite and augite, with minor amounts of feldspathoids and sometimes plagioclase.
References in periodicals archive ?
Subduction then stopped, preserving the diamonds which had formed, and later these were transported to the surface by non-kimberlitic magmas such as leucitite, melilitite, nephelinite, and basanite--"diamonds have been found in several diatremes and dikes with these compositions in eastern Australia" (Barron et al.